Customer service can be basically divided into manual customer service and electronic customer service, among which manual customer service can be subdivided into three categories: text customer service, video customer service and voice customer service. Text customer service refers to customer service based on typing and chatting, video customer service refers to customer service based on voice and video, and voice customer service refers to customer service based on mobile phones. Customer service is generally divided into three categories in business practice, namely: pre-sales service, in-sales service and after-sales service.